R9 270x HDMI issues on Mojave

I just finished upgrading from High Sierra to Mojave, everything works except for my second screen.

From what I know the R9 270x should work OOB, and that has been the case for High Sierra with a little help from Lilu + WhateverGreen.

So far I've tried updating Lilu/WhateverGreen and messing a bit with the Graphics options in Clover. When I try to boot without injecting ATI all I get is a black screen after the Apple logo. If I do inject ATI I can get to the system but only DisplayPort works, I get no signal on HDMI. Booting with only HDMI results in a black screen after the Apple logo.

What's weird is that WhateverGreen doesn't even seem to be getting loaded, I see no sign of it when I run kextstat or ioreg.

submitted by /u/DigitalCrazy
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